Why will a delivery truck filled with birds sitting on its floor be heavier than a truck with the same birds flying around inside?

Ajoint produces movement when its angle decreases. which type of movement is it?

Astep up transformer has 250 turns on its primary and 500 turns on it secondary. when the primary is connected to a 200 v and the secondary is connected to a floodlight that draws 5a, what is the power output? show all of your work.

What is part of a line has one endpoint and continues in one direction?